release: prepare v0.3.0 - Architectural Improvements

- Kaizen-agentic framework integration as capability submodule
- Test reorganization by capability with better modularity
- Comprehensive capability inclusion management system
- Directory reorganization with logical separation
- Todofile system implementation replacing NEXT.md
- Historical file organization for cleaner structure

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

markitect/__version__.py

@@ -11,7 +11,7 @@ from pathlib import Path
 from typing import Optional
 
 # Base version from pyproject.toml
-__version__ = "0.2.0"
+__version__ = "0.3.0"
 
 def get_git_commit_hash() -> Optional[str]:
     """Get the current git commit hash if available."""